kscience/maps-kt
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loadTileAsync refactor

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loadTileAsync consumes all tileIds
This commit is contained in:
Lev Shagalov 2022-07-15 10:39:04 +03:00
parent fc0f223766
commit 5d3db81c4f
3 changed files with 49 additions and 42 deletions
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3
src/commonMain/kotlin/centre/sciprog/maps/compose/MapTileProvider.kt
View File

@ -2,7 +2,6 @@ package centre.sciprog.maps.compose
import androidx.compose.ui.graphics.ImageBitmap
import kotlinx.coroutines.CoroutineScope
import kotlinx.coroutines.Deferred
import kotlin.math.floor
data class TileId(
@ -17,7 +16,7 @@ data class MapTile(
)
interface MapTileProvider {
suspend fun loadTileAsync(id: TileId, scope: CoroutineScope): Deferred<MapTile>
suspend fun loadTileAsync(tileIds: List<TileId>, scope: CoroutineScope, onTileLoad: (mapTile: MapTile) -> Unit)
val tileSize: Int get() = DEFAULT_TILE_SIZE

47
src/jvmMain/kotlin/centre/sciprog/maps/compose/MapViewJvm.kt
View File

@ -17,7 +17,6 @@ import androidx.compose.ui.graphics.toArgb
import androidx.compose.ui.input.pointer.*
import androidx.compose.ui.unit.*
import centre.sciprog.maps.*
import kotlinx.coroutines.launch
import mu.KotlinLogging
import org.jetbrains.skia.Font
import org.jetbrains.skia.Paint
@ -46,21 +45,23 @@ actual fun MapView(
) {
var canvasSize by remember { mutableStateOf(DpSize(512.dp, 512.dp)) }
var viewPointOverride by remember { mutableStateOf<MapViewPoint?>(
if(config.inferViewBoxFromFeatures){
features.values.computeBoundingBox(1)?.let { box ->
val zoom = log2(
min(
canvasSize.width.value / box.width,
canvasSize.height.value / box.height
) * PI / mapTileProvider.tileSize
)
MapViewPoint(box.center, zoom)
var viewPointOverride by remember {
mutableStateOf<MapViewPoint?>(
if (config.inferViewBoxFromFeatures) {
features.values.computeBoundingBox(1)?.let { box ->
val zoom = log2(
min(
canvasSize.width.value / box.width,
canvasSize.height.value / box.height
) * PI / mapTileProvider.tileSize
)
MapViewPoint(box.center, zoom)
}
} else {
null
}
} else {
null
}
) }
)
}
val viewPoint by derivedStateOf { viewPointOverride ?: computeViewPoint(canvasSize) }
@ -163,21 +164,17 @@ actual fun MapView(
mapTiles.clear()
verticalIndices
val tileIds = verticalIndices
.flatMap { j ->
horizontalIndices
.asSequence()
.map { TileId(zoom, it, j) }
}
.forEach {
try {
launch {
mapTiles += mapTileProvider.loadTileAsync(it, this).await()
}
} catch (ex: Exception) {
logger.error(ex) { "Failed to load tile $it" }
}
}
mapTileProvider.loadTileAsync(
tileIds = tileIds,
scope = this
) { mapTiles += it }
}

41
src/jvmMain/kotlin/centre/sciprog/maps/compose/OpenStreetMapTileProvider.kt
View File

@ -6,10 +6,7 @@ import centre.sciprog.maps.LruCache
import io.ktor.client.*
import io.ktor.client.request.*
import io.ktor.client.statement.*
import kotlinx.coroutines.CoroutineScope
import kotlinx.coroutines.Deferred
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.async
import kotlinx.coroutines.*
import kotlinx.coroutines.sync.Semaphore
import mu.KotlinLogging
import org.jetbrains.skia.Image
@ -63,17 +60,31 @@ class OpenStreetMapTileProvider(
Image.makeFromEncoded(byteArray).toComposeImageBitmap()
}
override suspend fun loadTileAsync(id: TileId, scope: CoroutineScope) = scope.async {
semaphore.acquire()
try {
val image = cache.getOrPut(id) { downloadImageAsync(id) }
MapTile(id, image.await())
} catch (e: Exception) {
cache.remove(id)
throw e
} finally {
semaphore.release()
}
override suspend fun loadTileAsync(
tileIds: List<TileId>,
scope: CoroutineScope,
onTileLoad: (mapTile: MapTile) -> Unit,
) {
tileIds
.forEach { id ->
try {
scope.launch {
semaphore.acquire()
try {
val image = cache.getOrPut(id) { downloadImageAsync(id) }
val result = MapTile(id, image.await())
onTileLoad(result)
} catch (e: Exception) {
cache.remove(id)
throw e
} finally {
semaphore.release()
}
}
} catch (ex: Exception) {
logger.error(ex) { "Failed to load tile $id" }
}
}
}
companion object {